Composition board



June 1930. L; KIRSCHBRAUN COMPOSITION BOARD Filed Jan. 24, 1927 jam/mi.- glefiem zizimakZr am. I

Patented June 24,

UNITED STATES PATENT OFFICE LESTER KIRSOHIBRAUN, OF LEONIA, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE IPATENT AND LICENSING CORPORATION, OF BOSTON, MASSACHUSETTS, A.

CORPORATION 'OF MASSACHUSETTS comrosrrion BOARD Application filed January 24, 1927. Serial No. 163,000.

The object of this invention is to provide a composition board of suflicient durability and strength for use in various capacities, such for example in packaging fabricated roofing elements .such as strip shingles which are ordinarily made of roofingfelt impregnated and coated with asphalt and covered with granulated mineral. Heretofore it has been customary in packaging such roofing elements for shipment to as semble a suitable number of them, place a thin wooden boardon eachside of the bundle, and then to secure the package by two or more loops .ofwire or equivalent binding strand passed around the package and secured in closed loops. 'While wooden boards arein many ways desirable for this purpose,.they are at the same time objectionable on account of their tendency to curl, warp and split, resulting in a material loss. Furthermore, wood is becoming more difficult to obtain and is steadily increasing in price. By my invention, 1' provide a product which may be. utilized as a substitute for the-wooden packaging boards,

which is in many ways superior to the wood, and is also obtainable in practically ungmited quantities at a comparatively low gure.

My invention consists briefly in treating sheets of relatively high bibulous character, as forexample roofing felt, in such manner.

. as to substantially thoroughly impregnate the sheets with a saturating 'material which will dry to arigid gel-like structure surrounding the fibers of the sheet. As an example of a material 'offthis character which is readily obtainable, I ,may name sodium silicate. Two or more such sheets afterlbeing impregnated with material of the character indicated, are preferably stuck together with an adhesive, which may also by preference be sodium silicate,'this operation being assisted by means of suitable pressure and elevated temperature. The

- resulting laminated sheet is'stifi and durable, having comparatively great strength and high water-resistant properties Thisstructure is admirably suited for use in various capacities where thin wooden not of the presentinvention may be put,-

and is a perspective of a package of strip shingles with one corner of the shingles broken away to indicate more clearly the protective packaging boards on the side faces of the bundle. v

Figure 2 is a fragmentary section of one form of my improved composition board.

Figure 3 is a fragmentary section of another form of board embodying my invention.

Figure 4 shows a packaging board having metal ware pieces attached to the edges thereof.

Figure 5 shows in perspective one form of wear piece.

Referring to the drawings'in detail, the board 11 is preferably composed of one or more layers of bibulous-sheets which can be saturated to a high degree, as for example roofing felt'such as is customarily used in the fabricated roofing industry as a foundation or base for asphalt-impregnated roofing elements. For certain uses, one layer of material may be found sufficient, while for others, two or more such layers securely stuck'together will be found desirable. In Figure 2 :a board comprising two layers is illustrated, each layer consisting of 'a sheet 13 ofroofing felt or similar material having a highly porous or bibulous The dried sheets of felt are then stuck together with suitable adhesive, preferably sodium. silicate. A film 14; of the adhesive is indicated in Figure 2, the thickness of the felt being considerably exaggerated. It is preferable to stick the laminae together with a very thin film of silicate, assisting the union of the sheets by subjecting the plied board to pressure and elevated temperature. lVhile only two sheets of felt are illustrated in Figure 2, it is obvious that three or more may be combined in the same way to build up a laminated sheet of any desired thickness according to the strength required. The resultant structure is characterized by its relatively great rigidity and toughness.

Although thoroughly dried sodium silicate is somewhat water-resistant, it may be desirable to supply a board which is-still further protected against deterioration by moisture. To this end, I may provide facing layers of any desired waterproof or water-resistant material, preferably sticking such layers to the felt laminae with sodium silicate or asphalt as an adhesive. such facing layers, I find waterproofed -paper satisfactory. Such paper for example may consist of a number of plies, one or more of which have been treated with emulsified asphalt in the stock chest of the paper machine or may consist of a plied paper having an interposed film of coalesced bitumin. Asphalt emulsion, such as that known as K-B, are miscible with the wet pulp in a paper machine and can be deposited with the pulp on the paper-forming wire screen. When the paper is dried, the miscroscopic globules of asphalt which have been held in suspension coalesce, and thus render the ply of the paper which contains themhighly water-resistant. Figure 3 illustrates a composition board made by sticking together two sheets of roofing felt which have previously been saturated with sodium silicate and dried. To one or both faces of the lammated board 1s applied a facing layer of paper 15 having a water-resistant ply 16 which as shown in Figure 3 is preferably deposited next to the plyof" the board to which the paper is stuck. It is obvious that the number and arrangement of plies in the water-resistant paper can be varied, also that such paper facing layers may be applied to laminated boards built up of any desired number of laminae, If more complete protection of the laminae against moisture is desired, the water-repellant paper facing layer may be extended over the edges of the boards after the latter have been cut to shape.

A bundle of roofing elements such as strip shingles are indicated at 10, this bundle of shingles having protective packaging boards 11 made of saturated roofing felt as hereinafter described. The package For is held to gether as by suitable wires or strands 12 which are passed around the package and secured in closed loops.

'In order to protect the side edges of the composition board from being cut into by the binding strands 12, I may secure thereto suitable wear pieces 17, preferably of metal as shown in Figure 5, to serve as contact .areas for the binding wires at the edges of the board. If fiat strips of metal or other material are used for binding the bundles, such wear pieces may not be considered necessary.

My improved composition board is simple and easy to .make, can be produced at a very low. cost from materials readily obtainable" in practically unlimited quantities, is tough and durable in use, and is admirably adapted for the special purpose herein indicated, namely, the packaging of bundles of roofing elements, as well as wall board, panel board, and as a base for a rigid roofing element. In this latter case, it may be coated with asphaltic material and thereafter surfaced with a suitable comminuted material.

or scope as defined by the appended claims. v

1. A laminated composition board comprising a layer of fibrous roofing felt material having its fibers surrounded by a mineral gel, and a facing layer of paper containing water-resistant material, said layers being stuck together with an adhesive.

2; A laminatedcomposition "board comprising a plurality of layers of roofing felt saturated with sodium silicate, said layers being adhesively united in face to face relationship and a facing layer of water re-' sistant paper stuck to a face of said board.

3. A laminated packaging board for fabricated strip shingles comprising a plurality of layers of roofing felt of suitable size and shape impregnated and stuck tosignature. 

